The Zodiac Classic Mark 2 ST 2011 vs Zodiac Zoom 310 S 2006 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
Size is the most obvious dividing line here. The Zodiac Classic Mark 2 ST 2011 measures 13,8 feet overall (2011), giving it roughly 12,8 additional feet of deck space compared to the Zodiac Zoom 310 S 2006 at 1,0 feet (2006). At 183 lbs and 84 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
The power gap is worth calling out. Rated to 40 hp, the Zodiac Classic Mark 2 ST 2011 has a 34-hp advantage over the Zodiac Zoom 310 S 2006's 6-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Zodiac Classic Mark 2 ST 2011 is rated for 7 passengers, while the Zodiac Zoom 310 S 2006 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Zodiac Classic Mark 2 ST 2011 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Zodiac Classic Mark 2 ST 2011 comes in at 5 lbs per hp versus 14 lbs per hp for the Zodiac Zoom 310 S 2006. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
The Zodiac Classic Mark 2 ST 2011 has a documented top speed of 34 mph. Speed data wasn't available for the other model.
Bottom line: Choose the Zodiac Classic Mark 2 ST 2011 if your priority is putting more people on the water — it handles 7 passengers and at 13,8 ft it has the deck room to back that rating up comfortably. The Zodiac Zoom 310 S 2006 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.